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Chitin and chitosan are useful in cosmetics for oral care, haircare, and skincare, including UV protection and strength improvement.

Hormones like estrogen, testosterone, progesterone, and prolactin play complex roles in female sexual function, with testosterone potentially improving sexual desire, arousal, and satisfaction. However, more research is needed to establish safe and effective hormone treatments for female sexual dysfunction.

Eating the right nutrients can improve hair health, but taking extra supplements usually doesn't help unless you have a deficiency.

New hormonal contraceptives are safer, have fewer side effects, and offer health benefits for women.

Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.

Pregnant women often experience skin and hair changes, with over half getting stretch marks and pigment changes, and should be cautious with cosmetic procedures due to potential risks.

The conclusion is that a new biopsy technique and humidity chamber help study skin mites better and suggest mite overpopulation may cause skin diseases.

The document concludes that identifying the cause of amenorrhea is crucial for proper treatment.

Genetically-altered adult stem cells can help in wound healing and are becoming crucial in regenerative medicine and drug design.

Different sports can cause specific skin conditions that need proper diagnosis and treatment.

Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Changing light exposure can affect hair growth timing in goats, possibly due to a key gene, CSDC2.

Lack or blocking of SRD5a, a key component in hormone creation, can lead to conditions like pseudohermaphrodism and affect hair growth, bone mass, muscle strength, and reproductive health. More research is needed on its regulation from fertilization to adulthood.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

Scalp flaps are used for reconstruction, considering factors like inelasticity, hair growth, and blood supply, with techniques adapting to age-related changes in vascularity.

Fiber implantation for baldness is not recommended because it causes many problems and doesn't work well.

Ultraviolet rays damage hair, smoking may cause hair loss, and good nutrition is important for hair health, but genetics mainly decide hair thickness.

The document says menstruation is important for women's health, discusses menstrual disorders, and suggests personalized treatment options.

Best hair transplant results happen when tissues are least damaged.

Hormone therapy in transgender women can affect hair growth and acne, and there are specific skin issues related to gender-affirming surgery, but more research is needed on their dermatological health.

The document concludes that careful planning and consideration of male brow anatomy are essential for successful facial rejuvenation with cosmetic surgery.

The new method is rapid, sensitive, and accurate for evaluating the quality of the medicinal herb Platycladi cacumen.

Tip cryotherapy effectively treats idiopathic guttate hypomelanosis with minimal side effects.

Using a blow dryer in a certain way can cause localized hair damage with bubble formation inside the hair.

A 17-year-old female with adrenogenital syndrome produces very high levels of androgens, which prevent complete feminization despite high estrogen doses.

Skin cell-derived vesicles can help heal skin injuries effectively.

The new hydrogel is good for wound dressing because it absorbs water quickly, has high porosity, can release drugs, fights bacteria, and helps wounds heal with less scarring.

Elderly men with a scalp condition healed in about 26 days using specific creams and dressings, with no return of the condition in 6 months.

Horse skin diseases are complex to manage and often require a biopsy for accurate diagnosis and treatment.

The document concludes that individualized treatment for malignant epithelial tumors is necessary and more research on metastatic squamous cell carcinoma treatments is needed.